The thing is, if anyone would have actually realized it (other than Jai) it would have been hopefully fixed. Like... no one would just see that and say "well, must have been a typo" and just leaves it.
I am not saying people would have said Jia is acting maliciously, just noone saw this to begin with else it would have been fixed in a separate patch (before the emergancy fix recently by Lasse)
XZ is just a really boring project. It seems complete for the most part, so I'm not surprised by the lack of scrutiny. It's one of these projects that I would just assume is well maintained.